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(11)

EP 2 215 669 A1

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(43) Date of publication: 11.08.2010 Bulletin 2010/32 (21) Application number: 08857116.1 (22) Date of filing: 28.11.2008

(51) International Patent Classification (IPC):  H01L 41/09(2006.01) G02B 13/00(2006.01) G02B 7/08(2006.01) (86) International application number: PCT/EP2008/066448 (87) International publication number: WO 2009/071491 (11.06.2009 Gazette 2009/24)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR Designated Extension States: AL BA MK RS (30) Priority: 03.12.2007 US 999254 (71) Applicant: Nokia Corporation 02150 Espoo (FI)	(72) Inventors: TREVELYAN, Philip Surrey GU15 3NW (GB) MELLOW, Tim Farnham Surrey GU9 9GH (GB) (74) Representative: Tognetty, Virpi Maria  Nokia Corporation IPR Department Keilalahdentie 4 02150 Espoo 02150 Espoo (FI)